Improvement in paper-feeding devices



A. A. DUNK.

Paper-Feeding Device.

Patented Nov. 12, 1872.

AMPHOTC LITHOG/TAPHIC cu. MK/assamvs's moms.)

UNITED STATES PATENT ARMAND A. DUNK, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT lN PAPER-FEEDING DEVICES.

Specification forming part of Letters Patent No.132f904, dated November 12, 1872.

To all whom it may concern:

Be it known that I, ARMAND A. DUNK, of the city and county of Philadelphia, State of Pennsylvania, have invented an Auxiliary Feeding Device for Printing Machines, of which the following is a specification:

My invention consists of a device, too fully explained hereafter to need preliminary description, for aiding the nippers of a printing machine to withdraw a sheet of paper from the feed-table, and for preventing the slipping of the said paper in the nippers.

Figure l is a side view of sufficient of a printin g-press to show my improvement Figs. 2 and 3, sectional diagrams illustrating the operation of the device to which my invention especially relates; and Fig. 4, a plan view.

A represents the cylinder, which, by means of its nippers, described hereafter, seizes the paper and carries it to the point where it is acted upon by the type or printing-blocks, attachedeit-her to a reciprocating or rotating bed, the said roller A, which revolves in the direction of the arrow, serving as the platen. It should be understood in the outset, however, that my invention is not restricted to a printing-machine of this class, but may be applied to any printing-machine in which nippers are used for withdrawing paper from a feeding-table. B is the platform or table for con taining the pile of paper to be fed to the machine, sheet after sheet. Beneath this platform a horizontal shaft, D, is adapted to bearings in the frame of the machine, and this shaft carries two rollers, D, to accommodate which there are slots in the table, so that the surface of the latter shall be level with or very slightly below the peripheries of the wheels. A strap, (1-, attached to the periphery of asmall pulley, b, on the shaft D, passes partly round the said small pulley and partly round a pul ley, d, to which the strap is also attached, the pulley 61 being hung loosely to a pin on the frame of the machine. On this pulley cl is an arm, 0, which, under the circumstances vdescribed hereafter, is struck by a pin, f, on a wheel, G, secured to the shaft E of the cylinder A, thereby causingthe shaft D to turn in the direction of its afiows to a limited extent; when the arm 6, however, is released from the pin f, the shaft D, acted upon by a suitable spring, instantly recovers its former position.

Immediately above the rollers D are two rollers, H H, each carried by an arm, I, secured to a rock-shaft, J, adapted. to brackets K K secured to the frame of the machine. A11 arm, h, on the rock-shaft J, is connected by a rod, 6, to an arm, m, hung to the frame of the machine, and shown by dotted lines in Fig. 3, this arm m bearing on a cam, a, secured to the shaft E of the cylinder A. As long as that portion of the cam n which is concentric with the shaft is in contact with the arm m, the arms I and rollers H will be elevated, as shown in Fig. 8, but when the recessed portion of the cam passes the end of the arm at the latter will fall, as will also the rollers H, which are thus brought to bear with their own weight on the rollers D, as shown in Fig. 2. In the cylinder A, and extending nearly across the same, is a recess, 00, for receiving the nipping bar w, the upper edge of which can be made to overlap one edge of the recess and confine the paper to the same, or can fall back to the opposite edge of the recess and thereby release the paper.

This nipping device is, in the present in stance, operated in a manner similar to that described in the Letters Patent for a printingpress granted to me on the 10th day of March,

,A. D. 1868, and therefore requires no further description; and it may be here remarked that my invention may be employed in connection with any of the nipping devices used in printing-presses.

The main complaint against the nippers of printing-presses is their inability to prevent the paper from slipping; this arises from the fact that the paper presented to the nippers is stationary, and the nippers are in the act of moving while they seize the paper, which is consequently started with a sudden jerk, and the paper is consequently liable to slip in the jaws of the nippers, the result being an uneven margin, or uneven printing on the paper. The object of my invention is to obviate this difficulty in a manner which I will now proceed to explain.

The periodical movcmentof the rollers D is such that their peripheries traverse at precisely the same speed as the nippers, and just as the latter are about to seize the edge of the sheet of paper on the platform B the rollers H descend and the rollers D begin to move in amen.

the direction of the arrow, Fig. 2, and the sheet of paper confined between the two sets of rollers must necessarily move with them, and at the same speed as the nippers, and hence there can be no such slipping of the paper as takes place when it is stationary at the time the nip pers seize it. After the paper has thus been fairly started on the platform at the proper speed and in the proper direction, and all danger of slipping has passed, the rollers H rise, the movement of the rollers D in the direction of the arrow ceases, and they are restored to their original position prior to acting on another sheet of paper while the nippers seize the same.

It will be evident that the mechanism for actuating the feed-rollers D and H may be varied without departing from the main feature of my invention; the operating mechanism The combination, substantially as described,

of the feed-rollers D D and H H, operating, in the manner set forth, with the feed table and nippers of a printing'machine.

I11 testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

A. A. DUNK.

Witnesses:

WM. A. STEEL, HARRY W. Dourr. 

